CN113221056B - Fault monitoring method, crankcase ventilation system and storage medium - Google Patents
Fault monitoring method, crankcase ventilation system and storage medium Download PDFInfo
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- CN113221056B CN113221056B CN202110438591.0A CN202110438591A CN113221056B CN 113221056 B CN113221056 B CN 113221056B CN 202110438591 A CN202110438591 A CN 202110438591A CN 113221056 B CN113221056 B CN 113221056B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a fault monitoring method, a crankcase ventilation system and a storage medium, wherein the fault detecting method is applied to the crankcase ventilation system and comprises the following steps: acquiring the running state of a vehicle, and judging whether the crankcase ventilation system meets a first monitoring condition according to the running state of the vehicle; if yes, acquiring an intake manifold pressure value, an intake manifold temperature value and a throttle valve pressure value, and judging whether the low-load ventilation pipe has faults or not; if the crankcase ventilation system does not meet the first monitoring condition, judging whether the crankcase ventilation system meets the second monitoring condition according to the running state of the vehicle; and if the crankcase ventilation system meets the second monitoring condition, acquiring the pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe. The invention realizes fault monitoring of the crankcase ventilation pipe and reduces the fuel consumption of the vehicle.
Description
Technical Field
The present disclosure relates to the field of vehicle technologies, and in particular, to a fault monitoring method, a crankcase ventilation system, and a computer readable storage medium.
Background
During operation of the engine, unburned gas mixture in the cylinder may blow-by into the crankcase through the clearance between the piston and the cylinder liner. The crankcase ventilation system functions to reintroduce unburned mixture into the crankcase for combustion. A PCV (Positive Crankcase Ventilation) valve, a OBD (On Board Diagnostics) system and an air inlet manifold are arranged in a crankcase, if a PCV valve of the crankcase or the PCV valve is disconnected with the air inlet manifold, an OBD system should detect faults, in the prior art, when the vehicle air conditioner compressor is in an operating state, the air conditioner operating power of the air conditioner compressor is obtained, the engine rotating speed of the vehicle is determined according to the air conditioner operating power, and whether the break faults exist in a crankcase ventilation pipe or not is judged according to the rotating speed of the engine.
Disclosure of Invention
The invention mainly aims to provide a fault monitoring method, a crankcase ventilation system and a computer readable storage medium, and aims to solve the problem that the existing crankcase fault monitoring method can only be applied to the condition that a crankcase ventilation pipeline is relatively thick.
To achieve the above object, the present invention provides a fault detection method applied to a crankcase ventilation system, comprising the steps of:
acquiring the running state of a vehicle, and judging whether the crankcase ventilation system meets a first monitoring condition according to the running state of the vehicle;
if yes, acquiring an intake manifold pressure value, an intake manifold temperature value and a throttle valve pressure value, and judging whether the low-load ventilation pipe has faults or not;
if not, judging whether the crankcase ventilation system meets a second monitoring condition according to the running state of the vehicle;
and if the crankcase ventilation system meets the second monitoring condition, acquiring the pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe.
Optionally, the step of obtaining the intake manifold pressure value, the intake manifold temperature value and the throttle valve pressure value and judging whether the low-load ventilation pipe is faulty comprises:
acquiring an intake manifold pressure value and an intake manifold temperature value, and calculating a main charge air amount according to the intake manifold pressure value and the intake manifold temperature value;
acquiring the front and rear pressure values of the throttle valve, and calculating the secondary air charging amount according to the front and rear pressure values of the throttle valve;
correcting the secondary charging air inflow according to the deviation of the primary charging air inflow and the secondary charging air inflow, and judging whether the corrected value of the secondary charging air inflow is larger than a first preset threshold value or not;
if yes, the low-load ventilation pipe is judged to be faulty.
Optionally, the step of obtaining the pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe has a fault according to the pressure value of the high-load ventilation pipe comprises the following steps:
acquiring a first pressure value in a high-load ventilation pipe, an engine speed and an engine load at preset intervals, and converting the first pressure value into a first energy value;
calculating a second pressure value in the high-load ventilation pipe corresponding to each preset period according to the engine speed and the engine load corresponding to each preset period, and converting the second pressure value into a second energy value;
and judging whether the high-load ventilation pipe fails according to the first energy value and the second energy value.
Optionally, the step of determining whether the high-load ventilation pipe has a fault according to the first energy value and the second energy value includes:
respectively accumulating the first energy value and the second energy value to a first accumulated energy value and a second accumulated energy value, and judging whether the second accumulated energy value is larger than a second preset threshold value or not;
if so, judging whether the accumulated time of the second accumulated energy value from 0 to more than a second preset threshold is more than a third preset threshold;
if the accumulated time is greater than a third preset threshold value, calculating a deviation value between the first accumulated energy value and the second accumulated energy value;
and judging whether the high-load ventilation pipe fails according to the deviation value.
Optionally, the deviation value is calculated by the following formula:
wherein D is the offset value, ΣE (p 1 ) Is the first energy cumulative value, Σe (p 2 ) Is the second energy accumulated value, p 1 Is a first pressure value, p 2 Is the second pressure value.
Optionally, if the accumulated time is greater than a third preset threshold, the step of calculating the deviation value between the first accumulated energy value and the second accumulated energy value includes:
if the accumulated time is greater than a third preset threshold, controlling the value of the diagnostic counter to be accumulated according to the preset value;
judging whether the deviation value is larger than a preset diagnosis threshold value according to the magnitude of the deviation value;
if yes, the fault counter is controlled to accumulate according to a preset value;
if not, controlling the fault counter to accumulate and subtract according to a preset value;
the step of accumulating or subtracting the control fault counter according to the preset value also comprises the following steps:
judging whether the value of a diagnosis counter of the crankcase ventilation system is larger than or equal to the value of a preset diagnosis counter or not, and judging whether the value of a fault counter is larger than the value of the preset fault counter or not;
if yes, judging that the high-load ventilation pipe is faulty.
In order to achieve the above object, the present invention also provides a crankcase ventilation system, which is applied to the fault monitoring method as described above, the crankcase ventilation system including an intake manifold assembly, a PCV valve, an oil-gas separator connected to the PCV valve, a low-load ventilation pipe communicating the intake manifold assembly and the PCV valve, a high-load ventilation pipe connected to the PCV valve, and an intake pipe connected to the high-load ventilation pipe, a throttle valve connecting the intake manifold assembly and the intake pipe.
Optionally, the high-load ventilation pipe includes first high-load ventilation pipe, second high-load ventilation pipe and pressure sensor, first high-load ventilation pipe with PCV valve, intake pipe connects gradually, pressure sensor installs first high-load ventilation pipe with the junction of second high-load ventilation pipe.
To achieve the above object, the present invention also provides a vehicle comprising a crankcase ventilation system as described above, a memory, a processor, and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the fault monitoring method as described above.
The invention provides a fault monitoring method, a crankcase ventilation system and a computer readable storage medium, wherein whether the crankcase ventilation system meets a first monitoring condition or not is judged according to the running state of a vehicle by acquiring the running state of the vehicle, and the first monitoring condition is that the rotating speed of an engine of the vehicle is in a fault state; the rotation speed fluctuation is not in a preset threshold range; the vehicle engine load is in a fault state; the throttle valve normally operates; the air inlet pressure temperature sensor normally operates, acquires an air inlet manifold pressure value, an air inlet manifold temperature value and a throttle valve pressure value, and judges whether the low-load ventilation pipe breaks down or not so as to monitor whether the low-load ventilation pipe breaks down or not, and the condition that the mixed gas concentration is abnormal and the engine is not normally operated due to the fact that the low-load ventilation pipe breaks down is avoided; judging whether the crankcase ventilation system meets a second monitoring condition or not, if yes, acquiring a pressure value of the high-load ventilation pipe, judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe, and monitoring the failure of the high-load ventilation pipe, wherein the second monitoring condition is that the temperature of engine cooling liquid exceeds a threshold value; the ambient temperature exceeds a threshold; the vehicle engine speed is in a fault state; the intake air flow is in a fault state; the intake air flow fluctuation is in a fault state; the throttle opening fluctuation is in a fault state; turbocharger control activation; no vehicle turbocharger related faults; there is no pressure sensor failure. Meanwhile, the invention can monitor crankcase ventilation pipelines with any size, avoid the increase of engine oil loss of the vehicle caused by the failure of the crankcase pipelines, and reduce the use cost of the vehicle.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the system configuration of the crankcase ventilation system of the invention;
FIG. 3 is a flow chart of a first embodiment of the fault monitoring method of the present invention;
FIG. 4 is a detailed flowchart of step S20 in a second embodiment of the fault detection method according to the present invention;
FIG. 5 is a detailed flowchart of step S40 in a third embodiment of the fault detection method according to the present invention;
FIG. 6 is a detailed flowchart of step S43 in a third embodiment of the fault detection method according to the present invention;
fig. 7 is a flow chart of a fourth embodiment of the fault monitoring method of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic hardware structure of a crankcase ventilation system according to various embodiments of the invention. The crankcase ventilation system comprises a communication module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the crankcase ventilation system shown in fig. 1 may also include more or fewer components than shown, or may combine certain components, or may be a different arrangement of components. The processor 03 is connected to the memory 02 and the communication module 01, respectively, and a computer program is stored in the memory 02 and executed by the processor 03 at the same time.
The communication module 01 is connectable to an external device via a network. The communication module 01 can receive data sent by external equipment, and can also send data, instructions and information to the external equipment, wherein the external equipment can be electronic equipment such as a mobile phone, a tablet personal computer, a notebook computer, a desktop computer and the like.
The memory 02 is used for storing software programs and various data. The memory 02 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the stored data area may store data or information created from the use of the crankcase ventilation system, etc. In addition, memory 02 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
The processor 03, which is a control center of the crankcase ventilation system, connects various parts of the entire crankcase ventilation system using various interfaces and lines, performs various functions of the crankcase ventilation system and processes data by running or executing software programs and/or modules stored in the memory 02, and recalling data stored in the memory 02, thereby performing overall monitoring of the crankcase ventilation system. The processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, an application program, etc., and the modem processor mainly processes wireless communication. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
It will be appreciated by those skilled in the art that the crankcase ventilation system structure shown in fig. 1 is not limiting of the crankcase ventilation system and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
Referring to fig. 2, in an embodiment, the crankcase ventilation system includes an intake manifold assembly 004, a PCV valve 002, an oil separator 001 connected to the PCV valve 002, a low-load ventilation pipe 003 communicating the intake manifold assembly 004 and the PCV valve 002, a high-load ventilation pipe 009 connected to the PCV valve 002, an intake pipe 006 connected to the high-load ventilation pipe 009, and a throttle valve 008 connecting the intake manifold assembly 004 and the intake pipe 006.
In this embodiment, the low load vent line 003 and the high load vent line 009 are collectively referred to as crankcase vent lines. The low-load ventilation pipe 003 is fixed in a mode that two ends are clamped by a clamp. During low load conditions, blow-by gas in the crankcase may be drawn into the intake manifold assembly 004 through the low load vent line 003 because of the negative pressure present in the intake manifold. When the low-load vent pipe 003 breaks down, blow-by gas in the crankcase leaks to the atmosphere, and therefore the low-load vent pipe 004 is monitored for the break-down failure, and the blow-by gas is prevented from leaking.
In the middle-high load working condition, the air inlet manifold assembly 004 has no negative pressure, and at the moment, the negative pressure exists in the air inlet pipe 006, so that the blowby gas in the crankcase can be sucked into the air inlet pipe 006 through the high-load ventilation pipe 009, the blowby gas is prevented from leaking into the atmosphere through the crankcase ventilation system, and meanwhile, the fuel consumption of the vehicle is reduced.
Further, the high-load ventilation pipe 009 includes a first high-load ventilation pipe 005, a second high-load ventilation pipe 010, and a pressure sensor 007, wherein the first high-load ventilation pipe 005 is sequentially connected with the PCV valve 002 and the air intake pipe 006, and the pressure sensor 007 is installed at the connection part of the first high-load ventilation pipe 005 and the second high-load ventilation pipe 010.
In the embodiment, the pressure value in the high-load ventilation pipe is read through the pressure sensor arranged on the high-load ventilation pipe, and whether the high-load ventilation pipe falls off or not is monitored through the pressure condition in the high-load ventilation pipe, so that the detection degree is accurate.
According to the above hardware structure, various embodiments of the method of the present invention are presented.
Referring to fig. 3, in a first embodiment of the fault monitoring method of the present invention, the fault monitoring method is applied to a crankcase ventilation system, comprising the steps of:
step S10, acquiring the running state of a vehicle, and judging whether a crankcase ventilation system meets a first monitoring condition according to the running state of the vehicle;
in this embodiment, the running state of the vehicle is specifically: engine speed, engine speed fluctuation, vehicle engine load, throttle intake air amount, throttle operating state, pressure sensor operating state, etc.; the first monitoring condition specifically includes: the vehicle engine speed is in a fault state; the fluctuation of the rotating speed is not in a preset range, the preset range is-30 rpm to 30 rpm, and a person skilled in the art can set different preset ranges according to actual needs so as to realize fault monitoring of the low-load ventilation pipe; the first monitored condition further includes: the vehicle engine load is in a fault state; the throttle valve normally operates; the intake air pressure temperature sensor operates normally.
Step S20, if yes, acquiring an intake manifold pressure value, an intake manifold temperature value and a throttle valve pressure value, and judging whether the low-load ventilation pipe is in fault or not;
in this embodiment, the intake manifold value may be read in accordance with an intake pressure temperature sensor installed in the intake manifold; the throttle pressure value includes: the amount of pressure generated at the end of the throttle valve facing the intake manifold when the gas passes through the intake pipe is equal to the amount of pressure generated at the end of the throttle valve facing the intake pipe when the gas enters the intake pipe.
Step S30, if not, judging whether the crankcase ventilation system meets a second monitoring condition according to the running state of the vehicle;
in this embodiment, the second monitoring condition specifically is: the temperature of the engine coolant exceeds a threshold, the threshold can be obtained specifically according to the calibration verification of the engine, different engines adopt different thresholds, and the engine coolant temperature is not limited herein; the ambient temperature exceeds a threshold value, the ambient temperature can be 40 ℃, and a person skilled in the art can determine different temperature thresholds according to the rated ambient temperature when a specific engine works so as to ensure the normal work of the engine; the second monitored condition further comprises: the vehicle engine speed is in a fault state; the intake air flow is in a fault state; the intake air flow fluctuation is in a fault state; the throttle opening fluctuation is in a fault state; turbocharger control activation; no vehicle turbocharger related faults; there is no pressure sensor failure. The information of the engine rotating speed, the air inlet flow fluctuation, the throttle valve opening fluctuation and the like can be obtained through corresponding sensors.
And S40, if the crankcase ventilation system meets the second monitoring condition, acquiring the pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe.
In this embodiment, the pressure value of the high-load ventilation pipe may be read according to a pressure sensor installed between the high-load ventilation pipes.
According to the invention, whether a crankcase ventilation system meets a first monitoring condition or not is judged according to the running state of a vehicle by acquiring the running state of the vehicle, wherein the first monitoring condition is that the rotation speed of an engine of the vehicle is in a fault state; the rotation speed fluctuation is not in a preset threshold range; the vehicle engine load is in a fault state; the throttle valve normally operates; the air inlet pressure temperature sensor normally operates, acquires an air inlet manifold pressure value, an air inlet manifold temperature value and a throttle valve pressure value, and judges whether the low-load ventilation pipe breaks down or not so as to monitor whether the low-load ventilation pipe breaks down or not, and the condition that the mixed gas concentration is abnormal and the engine is not normally operated due to the fact that the low-load ventilation pipe breaks down is avoided; judging whether the crankcase ventilation system meets a second monitoring condition or not, if yes, acquiring a pressure value of the high-load ventilation pipe, judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe, and monitoring the failure of the high-load ventilation pipe, wherein the second monitoring condition is that the temperature of engine cooling liquid exceeds a threshold value; the ambient temperature exceeds a threshold; the vehicle engine speed is in a fault state; the intake air flow is in a fault state; the intake air flow fluctuation is in a fault state; the throttle opening fluctuation is in a fault state; turbocharger control activation; no vehicle turbocharger related faults; there is no pressure sensor failure. Meanwhile, the invention can monitor crankcase ventilation pipelines with arbitrary size and thickness, avoid the increase of engine oil loss of the vehicle caused by the failure of the crankcase pipelines, and reduce the use cost of the vehicle.
Further, referring to fig. 4, in the fault monitoring method according to the present invention according to the first embodiment of the present invention, the present invention proposes a second embodiment, and the step S20 includes:
s21, acquiring an intake manifold pressure value and an intake manifold temperature value, and calculating a main charge air amount according to the intake manifold pressure value and the intake manifold temperature value;
in the present embodiment, the intake manifold pressure value and the temperature value may be obtained directly from a pressure temperature sensor installed in the intake manifold, and the main charge intake air amount is the intake air amount obtained by converting the pressure and the temperature in the intake manifold into the intake air amount.
Step S22, acquiring the front and rear pressure values of the throttle valve, and calculating the secondary air charging amount according to the front and rear pressure values of the throttle valve;
in this embodiment, the throttle front-rear pressure value includes: when the gas passes through, the pressure generated at one end of the throttle valve facing the air inlet manifold is the front throttle pressure, and when the gas enters the air inlet pipe, the pressure generated at one end of the throttle valve facing the air inlet pipe is the rear throttle pressure. The secondary air charging amount is obtained through calculating the ratio of the front throttle pressure value to the rear throttle pressure value.
Step S23, correcting the secondary charge air inflow according to the deviation of the primary charge air inflow and the secondary charge air inflow, and judging whether the corrected value of the secondary charge air inflow is larger than a first preset threshold value;
in this embodiment, to ensure the accuracy of the calculation of the secondary air intake amount, the vehicle electronic control unit corrects the secondary air intake amount according to the deviation between the primary air intake amount and the secondary air intake amount, and when the deviation value is larger, the correction value is larger, the first preset threshold value is 15kg/h, specifically may be 20kg/h, 25kg/h, and 50kg/h, the correction value of the secondary air intake amount is determined according to the difference of the engines, and different engines have different correction values of the secondary air intake amount, and can be obtained through calibration and verification of the engines. The first preset threshold can be set by a person skilled in the art according to the difference of the engines so as to realize fault monitoring of the low-load ventilation pipe.
Step S24, if yes, judging that the low-load ventilation pipe has a fault;
according to the invention, the working condition of the low-load ventilation pipe is monitored by calculating the correction value between the main charge air inflow and the secondary charge air inflow, so that whether the low-load ventilation pipe breaks down or not can be timely found, the increase of the fuel consumption of the engine caused by the fault of the low-load ventilation pipe is prevented, and the oil leakage of the engine is prevented.
Further, referring to fig. 5, in the fault monitoring method according to the present invention according to the first embodiment of the present invention, the present invention proposes a third embodiment, and the step S40 includes:
step S41, acquiring a first pressure value in the high-load ventilation pipe, an engine speed and an engine load at intervals of a preset period, and converting the first pressure value into a first energy value;
in this embodiment, specifically, a first pressure signal obtained by detecting a pressure sensor disposed in a high-load ventilation pipe may be filtered to obtain a specific first pressure value, and then the first pressure value is squared to obtain a first energy value corresponding to the first pressure value; the preset period can be 1s, 5s, 10s or 60s, and a person skilled in the art can set the period according to actual requirements so as to realize fault monitoring of the high-load ventilation pipe.
Step S42, calculating a second pressure value in the high-load ventilation pipe corresponding to each preset period according to the engine speed and the engine load corresponding to each preset period, and converting the second pressure value into a second energy value;
in this embodiment, specifically, the calculated second pressure signal may be filtered to obtain a specific second pressure value, and then the second pressure value is squared to obtain a second energy value corresponding to the second pressure value; the engine speed and the engine load may be obtained according to vehicle interior equipment, and may specifically be a speed sensor and a load sensor.
Step S43, judging whether the high-load ventilation pipe has faults or not according to the first energy value and the second energy value;
referring to fig. 6, the step S43 includes:
step S431, accumulating the first energy value and the second energy value to a first accumulated energy value and a second accumulated energy value, respectively, and determining whether the second accumulated energy value is greater than a second preset threshold;
in this embodiment, the accumulated energy value is accumulated according to time, the second preset threshold is determined according to a difference between the engines, and different engines have different second accumulated energy values, which can be obtained by calibrating and verifying the engines.
Step S342, if yes, judging whether the accumulated time of the second accumulated energy value from 0 to more than a second preset threshold is more than a third preset threshold;
if not, executing step S30;
in this embodiment, the third preset threshold is an accumulated time for meeting the monitoring condition of the high-load ventilation pipe, the third preset threshold is determined according to the difference of the engines, and different engines have different third preset thresholds, which can be obtained through calibration and verification of the engines.
Step S343, if the accumulated time is greater than the third preset threshold, calculating a deviation value between the first accumulated energy value and the second accumulated energy value;
if the accumulated time is less than the third preset threshold, executing step S30;
in this embodiment, the deviation value may be specifically calculated by the following formula:
wherein D is the offset value, ΣE (p 1 ) Is the first energy cumulative value, Σe (p 2 ) Is the second energy accumulated value, p 1 Is a first pressure value, p 2 Is the second pressure value.
Step S344, judging whether the high-load ventilation pipe has a fault or not according to the deviation value;
according to the invention, the high-load ventilation pipe is subjected to fault monitoring through the pressure value in the high-load ventilation pipe, so that blowby gas in the crankcase is prevented from entering the atmosphere, the fault monitoring accuracy is improved, the method is suitable for crankcase ventilation systems of any specification, the design of crankcase ventilation pipelines is facilitated, and the design cost is reduced.
Further, referring to fig. 7, in the fault monitoring method according to the present invention according to the first embodiment of the present invention, the present invention proposes a fourth embodiment, and the step S343 includes:
step S344, if the accumulated time is greater than the third preset threshold, controlling the diagnostic counter value to accumulate according to the preset value;
in this embodiment, the diagnostic counter is specifically a diagnostic counter of a crankcase ventilation system, the preset value is specifically 1, and may also be 2 or 3, etc., and a person skilled in the art may set different preset values as required to implement normal operation of the diagnostic counter, and the process of accumulating is specifically: and when the accumulated time is greater than a third preset threshold, controlling the crankcase ventilation system diagnostic counter to be incremented by 1.
Step S345, judging whether the deviation value is larger than a preset diagnosis threshold value according to the magnitude of the deviation value;
in this embodiment, the preset diagnostic threshold is determined according to the difference between the engines, and different engines have different diagnostic thresholds, which can be obtained by calibrating and verifying the engines.
Step S346, if yes, the fault counter is controlled to accumulate according to a preset value;
step S347, if not, controlling the fault technician to accumulate and subtract according to a preset value;
in this embodiment, the preset value is specifically 1, and may also be 2 or 3, etc., and a person skilled in the art may set different preset values as required to implement normal operation of the fault counter, where a specific process is to control the fault technician to add 1 or subtract 1 when the condition is satisfied.
The step of accumulating or subtracting the control fault counter according to the preset value also comprises the following steps:
judging whether the value of a diagnosis counter of the crankcase ventilation system is larger than or equal to the value of a preset diagnosis counter or not, and judging whether the value of a fault counter is larger than the value of the preset fault counter or not;
in this embodiment, when the preset value is 1, the preset diagnostor value is 3; when the preset value is 2, the preset diagnostician value is 6; when the preset value is 3, the preset diagnostor value is 9, and so on. The preset fault counter value is specifically 0.
If yes, judging that the high-load ventilation pipe fails;
if not, step S10 is performed.
According to the invention, through the mutual matching of the diagnosis counter and the fault counter, the invention is suitable for crankcase ventilation systems of any specification, is beneficial to the design of crankcase ventilation pipelines, reduces the design cost and reduces the limitation of monitoring the existing crankcase ventilation pipelines.
The present invention also proposes a computer-readable storage medium on which a computer program is stored. The computer readable storage medium may be the Memory 02 in the crankcase ventilation system of fig. 1, or may be at least one of ROM (Read-Only Memory)/RAM (Random Access Memory ), magnetic disk, optical disk, etc., and the computer readable storage medium includes a plurality of information for causing the crankcase ventilation system to perform the method according to the embodiments of the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (9)
1. A fault detection method, wherein the fault detection method is applied to a crankcase ventilation system, comprising the steps of:
acquiring the running state of a vehicle, and judging whether a crankcase ventilation system meets a first monitoring condition according to the running state of the vehicle, wherein the first monitoring condition comprises that the rotating speed of an engine of the vehicle is in a fault state; the rotation speed fluctuation is not in a preset range; the vehicle engine load is in a fault state; the throttle valve normally operates; the intake pressure temperature sensor operates normally;
if the crankcase ventilation system meets the first monitoring condition, acquiring an intake manifold pressure value, an intake manifold temperature value and a throttle valve pressure value, and judging whether the low-load ventilation pipe fails or not;
if the crankcase ventilation system does not meet the first monitoring condition, judging whether the crankcase ventilation system meets the second monitoring condition according to the running state of the vehicle, wherein the second monitoring condition comprises that the temperature of engine coolant exceeds a threshold value; the ambient temperature exceeds a threshold; the vehicle engine speed is in a fault state; the intake air flow is in a fault state; the intake air flow fluctuation is in a fault state; the throttle opening fluctuation is in a fault state; turbocharger control activation; no vehicle turbocharger related faults; no pressure sensor failure;
if the crankcase ventilation system meets the second monitoring condition, acquiring a pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe fails according to the pressure value of the high-load ventilation pipe;
the step of obtaining the intake manifold pressure value, the intake manifold temperature value and the throttle valve pressure value and judging whether the low-load ventilation pipe has faults comprises the following steps:
acquiring an intake manifold pressure value and an intake manifold temperature value, and calculating a main charge air amount according to the intake manifold pressure value and the intake manifold temperature value;
acquiring the front and rear pressure values of the throttle valve, and calculating the secondary air charging amount according to the front and rear pressure values of the throttle valve;
correcting the secondary charging air inflow according to the deviation of the primary charging air inflow and the secondary charging air inflow, and judging whether the corrected value of the secondary charging air inflow is larger than a first preset threshold value or not;
if yes, the low-load ventilation pipe is judged to be faulty.
2. The fault monitoring method as claimed in claim 1, wherein the step of acquiring the pressure value of the high-load ventilation pipe and judging whether the high-load ventilation pipe has a fault according to the pressure value of the high-load ventilation pipe comprises:
acquiring a first pressure value in a high-load ventilation pipe, an engine speed and an engine load at preset intervals, and converting the first pressure value into a first energy value;
calculating a second pressure value in the high-load ventilation pipe corresponding to each preset period according to the engine speed and the engine load corresponding to each preset period, and converting the second pressure value into a second energy value;
and judging whether the high-load ventilation pipe fails according to the first energy value and the second energy value.
3. The fault monitoring method as claimed in claim 2, wherein said step of determining whether the high load ventilation pipe is faulty based on said first energy value and said second energy value comprises:
respectively accumulating the first energy value and the second energy value to a first accumulated energy value and a second accumulated energy value, and judging whether the second accumulated energy value is larger than a second preset threshold value or not;
if so, judging whether the accumulated time of the second accumulated energy value from 0 to more than a second preset threshold is more than a third preset threshold;
if the accumulated time is greater than a third preset threshold value, calculating a deviation value between the first accumulated energy value and the second accumulated energy value;
and judging whether the high-load ventilation pipe fails according to the deviation value.
4. A fault monitoring method as claimed in claim 3, wherein the deviation value is calculated by the formula:
wherein D is an offset value,is the first energy cumulative value, +.>Is the second energy cumulative value, +.>Is the first pressure value,/->Is the second pressure value.
5. The fault-monitoring method as claimed in claim 3, wherein the step of calculating a deviation between the first accumulated energy value and the second accumulated energy value if the accumulated time is greater than a third predetermined threshold value comprises:
if the accumulated time is greater than a third preset threshold, controlling the value of the diagnostic counter to be accumulated according to the preset value;
judging whether the deviation value is larger than a preset diagnosis threshold value according to the magnitude of the deviation value;
if yes, the fault counter is controlled to accumulate according to a preset value;
if not, controlling the fault counter to accumulate and subtract according to a preset value;
the step of accumulating or subtracting the control fault counter according to the preset value also comprises the following steps:
judging whether the value of a diagnosis counter of the crankcase ventilation system is larger than or equal to the value of a preset diagnosis counter or not, and judging whether the value of a fault counter is larger than the value of the preset fault counter or not;
if yes, judging that the high-load ventilation pipe is faulty.
6. A crankcase ventilation system, characterized in that the crankcase ventilation system is applied to the failure monitoring method according to any one of claims 1 to 5, and includes an intake manifold assembly, a PCV valve, an oil-gas separator connected to the PCV valve, a low-load ventilation pipe that communicates the intake manifold assembly and the PCV valve, a high-load ventilation pipe connected to the PCV valve, and an intake pipe connected to the high-load ventilation pipe, a throttle valve that connects the intake manifold assembly and the intake pipe.
7. The crankcase ventilation system of claim 6, wherein the high load ventilation pipe includes a first high load ventilation pipe, a second high load ventilation pipe, and a pressure sensor, the first high load ventilation pipe being connected in sequence to the PCV valve and the air intake pipe, the pressure sensor being mounted at a connection of the first high load ventilation pipe and the second high load ventilation pipe.
8. A vehicle comprising a crankcase ventilation system according to any of the preceding claims 6 or 7, a memory, a processor, and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the fault monitoring method according to any of the claims 1 to 5.
9. A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the fault monitoring method as claimed in any one of claims 1 to 5.
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